Drop Visual Studio 7 .NET 2003 generator

This generator has been deprecated since CMake 3.6.  Remove it.

Source/CPack/OSXScriptLauncher.cxx

@@ -85,8 +85,6 @@ int main(int argc, char* argv[])
   int length;
   while (cmsysProcess_WaitForData(cp, &data, &length, 0)) {
     // Translate NULL characters in the output into valid text.
-    // Visual Studio 7 puts these characters in the output of its
-    // build process.
     for (int i = 0; i < length; ++i) {
       if (data[i] == '\0') {
         data[i] = ' ';